Direction Finding of Very-Low-Latitude Whistlers and Their Propagation

  • M. Hayakawa
  • K. Ohta
  • S. Shimakura


Spaced direction finding measurements of very-low-latitude whistlers were carried out in January 1988 at three stations in South China; Zhanjiang (geomaglat. 10.1°), Guilin (14.1°) and Wuchang (19.4°). Two horizontal magnetic and one vertical electric field components were simultaneously recorded over a wide frequency range to enable comprehensive direction finding. The analyses of whistler data on several days have indicated that the ionospheric transmission latitude of equatorial latitude whistlers is restripted to the geomagnetic latitude range of 10–14°, and the presence of high occurrence of echo-train whistlers is a strong indication of their field-aligned propagation. The propagation mechanism of very-low-latitude whistlers is discussed.


Meridian Plane Geomagnetic Latitude Monopole Antenna Magnetic Meridian Plane Vertical Electric Field Component 
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  1. 1.
    Hayakawa M., Tanaka Y (1978) On the propagation of low-latitude whistlers. Rev. Geophys. Space Phys. 16: 111–123CrossRefGoogle Scholar
  2. 2.
    Ondoh T., Kohtaki M., Murakami T., Watanabe S., Nakamura Y (1979) Propa gation characteristics of low-latitude whistlers. J. Geophys. Res. 84: 2097–2104CrossRefGoogle Scholar
  3. 3.
    Andrews MK (1978) Non-ducted whistler-mode signals at low latitudes J. Atmos. Terr. Phys. 40: 429–436CrossRefGoogle Scholar
  4. 4.
    Liang BX., Bao ZT., Xu JS (1985) Propagation characteristics of night time whistlers in the region of equatorial anomaly. J. Atmos. Terr. Phys. 47: 999–1007CrossRefGoogle Scholar
  5. 5.
    Thomson NR (1987) Experimental observations of very low latitude man-made whistler-mode signals. J. Atmos. Terr. Phys. 49: 309–319CrossRefGoogle Scholar
  6. 6.
    Thomson NR (1987) Ray-tracing the paths of very low latitude whistler-mode signals. J. Atmos. Terr. Phys. 49: 321–338CrossRefGoogle Scholar
  7. 7.
    Hayakawa M., Ohta K., Shimakura S., Xu JS., Bao ZT., Liang BX (1988) A Proposal for multi-stationed direction finding measurements of lowand equatorial-latitude whistlers in China. Res. Lett. Atmos. Elect. 8: 31–35Google Scholar
  8. 8.
    Xu JS., Tian M., Tang CC., Hayakawa M., Ohta K., Shimakura S (1989) Dire ction finding of nighttime whistlers at very low latitudes in China Preliminary results. Planet. Space Sci. 37: 1047–1052.CrossRefGoogle Scholar
  9. 9.
    Hayakawa M., Ohta K., Shimakura S (1990) Spaced direction finding mea sûrement of very-low-latitude whistlers and their propagation. Accepted for publication in J. Geophys. Res.Google Scholar
  10. 10.
    Anderson DN., Kintner PM., Kelley MC (1985) Inference of equatorial field-line-integrated electron density values using whistlers. J. Atmos. Terr. Phys. 47: 989–997CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Tokyo 1991

Authors and Affiliations

  • M. Hayakawa
    • 1
  • K. Ohta
    • 2
  • S. Shimakura
    • 3
  1. 1.Research Institute of AtmosphericsNagoya UniversityAichiJapan
  2. 2.Department of Electronic EngineeringChubu UniversityAichiJapan
  3. 3.Department of Electrical EngineeringChiba UniversityChibaJapan

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